Solar Field CANDIA MARIS TEAB SA Solar Field and Energy Saving for - - PowerPoint PPT Presentation

Solar Field and Energy Saving for Hotels, case study: Candia Maris Hotel

Solar Field CANDIA MARIS TEAB SA

Motivations to implement energy-saving solutions in reference with hospitality in Greek Islands

• Large thermal loads (swimming pools, spa, athletic

facilities…)

• Availability of sites for solar panels
• Significant loads of air conditioning (common rooms and

resident rooms)

• Remarkable synchronisation between energy demand and

energy supply (during summer)

• Increasing cost of conventional energy sources
• More environmentally friendly attitude of the people versus

ecological solutions

Implementation of central solar plants

Small Hotels:

• Very common
• Rather simple
• Limited in production of usable hot water

Large Hotels:

• Not so common and more difficult
• Independence of their energy subsystems
• Presence of loads in different thermal levels
• Safe energy supply without operational problems
• Need for aggregate energy design
• Reliable and economically vital technical solutions

The case of CANDIA MARIS HOTEL The Hotel:

• Runs hall year
• 257 rooms
• 110.000 nights/year, 1 restaurant, 3 taverns, 1

snack-bar

• Conference center of 1.780 places
• Thalassotherapy
• Hydro massage
• Football and tennis fields

The case of CANDIA MARIS: Before the project (1)

Energy loads:

• Rooms, kitchen and restaurants: 30 m³ of usable hot water at 48º - 55ºC
• Spa (1): 3 indoor swimming pools with heating systems and one semi-

closed, 500 m³ sea water, 32 - 35ºC, 10% renewal/day

• Spa (2): 8 bath tubs 300 lt each, 53 m³/day hot sea and fresh water at 35º-

40ºC

• Hydro massage & sea water jet: 6 m³, 27 m³/day hot water at 38ºC
• Football and tennis: 14 showers, 5 m³/day hot water at 48º- 55ºC
• Air-conditioning: 2 water cooled units (300 RT)

The case of CANDIA MARIS: Before the project (2)

20 40 60 80 100 120 140 160 180 200 Load [MWh] 1 2 3 4 5 6 7 8 9 10 11 12 Month

• Swim. Pool 2
• Swim. Pool 1

Club House Baths (rooms) Thalassotherapy Shower Baths (thalas.)

Energy loads: evaluations (historical data)

• Thermal loads 2.166 MWh
• 3 boiler- rooms
• 6 boilers
• 47.630 lt of oil
• 449.651 lt of gas (LPG)
• Problem:water supply

3 tanks (500 m3) municipality water supply, bore, transfer with trucks

The case of CANDIA MARIS: applications of solutions in

solar and energy saving systems

General views:

• Central active solar system of

heating water

• Disposal thermal energy from

chillers in sea and partial recovery

• New engine rooms
• Reverse Osmosis
• Building Management System and

better control strategy

Solar field (2400 m2) Thermal storage (12 tanks, 60 m3) Swimming Pools

Chiller (condenser)

RO (feed water preheating) Baths Showers Thalassotherapy

Study and realisation

• Sol Energy Hellas S.A.

(URL: www.solenergy.gr)

Cooling Chiller by the sea

RO Thermal Storage Spa

Distribution engine room of usable hot water

The case of CANDIA MARIS HOTEL: General view

The case of CANDIA MARIS: Solar System

• 4 solar fields
• 850 collectors of high

performance (2.397 m2)

• 12 new storage tanks (60

m3)

• New engine room
• 3 plate heat exchangers
• 3 uses: hot water (Central

engine room), heating of sea water, heating system of swimming pools

Central machinery room

The case of CANDIA MARIS: Thalassotherapy

• 10 m3 storage

tanks of sea water, stored at 40º – 45οC

• Boilers (back up)
• Refurbished

plumping

Solar system & storage tanks

The case of CANDIA MARIS: Partial heat recovery and

disposal of the balance of the sea (chiller)

• Replacement of cooling

towers by 4 plate heat exchangers (made by titanium) which are cooled by sea water

• Temperature controlled

delivery (water flow)

• Recovery of heat (hot water

for desalination)

• Highest COP
• Higher cooling capacity

Cold sea water Preheated sea water (RO, Thalassotherapy)

The case of CANDIA MARIS: Desalination plant

• R.O. unit of 3rd generation
• 120 m3 per day
• pressure exchanger
• supply of preheated water

for higher performance

sea

Hot water (chillers, Solar systems, starage tanks)

The case of CANDIA MARIS HOTEL: Central control

• Building Management System (ΒΜS)
• Check all plants producing thermal energy and

energy saving

• Supervision and remote monitoring system
• Schematic
• Databases of measurements (heat meters,

temperatures, hot water supply, Βάζεις δεδομένων μεηρήζεων (θερμιδόμεηρα, θερμοκραζίες, Παροχές ζεζηού νερού, operation hours and electricity consumption)

The case of CANDIA MARIS: Primary results

• Measurement of actual energy savings:

fundamental conditions for further penetration of solar thermal technology and energy efficiency in the market.

• Candia Maris Hotel: Commitment of

guaranteed performance

• The operation of the system began

gradually on 1st of August in 2002

• After measurements it was revealed that

for a period of 8 months (July to February) there was a significant energy gain of about 740 MWh of actual savings (equivalent to 115.529 lt oil), although the region of Heraklion sunshine during this period was lower than the average of the last 10 years.

21 237 155 326

Central waterworks Swimming pool thalassotherapy Thalassotherapy Outdoor swimming pool

Typical conditions of coolers operation Before (without heat recovery) After (with heat recovery) Cold water temperature 8-13 οC 8-13 οC Condenser leaving temperature 40 οC (spring - autumn) 45 οC (summer) 30 οC Cooling power delivered 683 kW 654 kW 757 kW Absorbed power 178 kW 189 kW 153 kW COP 3,84 3,41 4,94

Heat recovery (chillers) Solar system

The case of CANDIA MARIS: Evaluation by others

10 20 30 40 50 60 70 80 90 6 8 10 12 14 16 18 20 Local time [oC] [kgm

• 2h-1]
• 100

100 300 500 700 900 1100 [wm -2] Tout Tin Flow G solar Pow er

0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 10,00 11,00 12,00 13,00 14,00 15,00 16,00 Local Hour efficiency n theor nexp,sm n exp

• Objective assessment
• Independent third party: Solar &

Other Energy Systems Laboratory NCSR “DIMOKRITOS”

• Accredited quality control

laboratory, performance and durability of thermal collectors and systems

• Measurements using calibrated tools

under actual operating conditions

• Laboratory will propose potential

interventions, based on analysis of measurements

• Optimizing the system to maximize

energy benefits

The case of CANDIA MARIS: Conclusion

• Thermal solar systems and energy savings in major hotel groups: a challenge for

investors, engineers and builders

• The success of such projects shall be the final energy and financial results
• Technology: central solar systems, recover from the condensers of central air

conditioning units, central control for monitoring and energy management of all energy subsystems

• Methodology: proper design of facilities, integrated management of different energy

needs, quality of used products from third objective assessment of actual energy charges.

• Candia Maris: experience shows that results can be really positive for investors in

the field of solar thermal systems in general.

The case of TERRA MARIS : Summary

The Hotel:

• Operates seasonal
• 141 room and suites. Also has Bungalows. The total number of bed served is 750

The case of TERRA MARIS : Summary

• 2 solar fields consisting of 390 panels Chromagen-CR120 central high

performance total area of 1.100 m2 located in the southwest part of the surroundings of the hotel (Solar park)  Thermogalvanised clamping brackets on the concrete structure which will be

• created. Consolidated construction of holders for panels on the building created

by thermogalvanised supports shaped L or I  Components for connecting collectors (taps, valves, fittings, automatic vents, etc.)  Regulatory valves, thermometers for 56 arrays.  Supply and installation of capture oxygen system (oxy-free) for the protection

• f solar fields closed circuit

 Installing the panels on the platforms and connecting them in arrays with the necessary components  Full hydraulic design, supervision and technical support of the entire plant

The case of TERRA MARIS : Summary

 Adjustment and balancing flows per array through regulatory valves using a microcomputer, recording each valve’s regulator setting and numbered per array  Boiler with a manhole 10 Χ 5.000lt = 50.000lt by DIN4801-2-3-4, Italian

• rigin, insulated with 10cm isulation

 Corrosion protection of Boilers with imposed current cathodic protection Guldager Denmark  2 pumps for solar fields, WILO inline.  2 pumps for Boiler- solar fields, WILO inline.  2 pumps Back-up WILO primary– secontary inline.  2 solar exchangers (plate – ORW 3)  1 Back-up exchanger (plate – ORW 3)

The case of TERRA MARIS : Summary

 8 electro valves δίοδες (trunk , μοχλισμός , engine ) Siemens  2 Θερμομικτικές τετράοδες valves Tour & Anderson, Sweden  Regulatory valves Tour & Anderson, Sweden  1 Calorimeter (trunk and electronic components of connection) Τechem, Germany  Complete plumbing installation for the interconnection of arrays of panels on the concrete structure which will be created and interface with existing equipment Provision of all ancillary equipment and installation  Insulation of all new networks

Presentation of energy benefits

 Total number of nights: 110.000  Needful thermal load: 989MWh  Needful LPG quantity: ~104.000lt  Load covered by solar field up to 85%  Total LPG quantity saved: ~88.000lt